How do I connect an EIP to a classic load balancer in AWS using Terraform?

I want to associate some permanent IP address to a load balancer on AWS. How do I do that? Do I use an EIP?

I'm new to AWS, and I'm new to Terraform. I had made the assumption that I could create an EIP in the console, and then connect it to a load balancer, but I see no documentation on that, so maybe I got that wrong.

If I go here:

https://www.typeerror.org/docs/terraform/providers/aws/r/eip_association

then I see this example:

resource "aws_eip_association" "eip_assoc" {
  instance_id   = "${aws_instance.web.id}"
  allocation_id = "${aws_eip.example.id}"
}

This shows how to connect an EIP to a specific EC2 instance, but I could not find an example that connects an EIP to a classic aws_elb load balancer.